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#include "ace/Barrier.h"
#if defined (ACE_HAS_THREADS)
#include "ace/Guard_T.h"
#include "ace/OS_NS_errno.h"
#if defined (ACE_HAS_ALLOC_HOOKS)
# include "ace/Malloc_Base.h"
#endif /* ACE_HAS_ALLOC_HOOKS */
#if defined (ACE_HAS_DUMP)
# include "ace/Log_Category.h"
#endif /* ACE_HAS_DUMP */
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
ACE_ALLOC_HOOK_DEFINE(ACE_Sub_Barrier)
void
ACE_Sub_Barrier::dump () const
{
#if defined (ACE_HAS_DUMP)
// ACE_TRACE ("ACE_Sub_Barrier::dump");
ACELIB_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
this->barrier_finished_.dump ();
ACELIB_DEBUG ((LM_DEBUG, ACE_TEXT ("running_threads_ = %d\n"), this->running_threads_));
ACELIB_DEBUG ((LM_DEBUG, ACE_END_DUMP));
#endif /* ACE_HAS_DUMP */
}
ACE_Sub_Barrier::ACE_Sub_Barrier (unsigned int count,
ACE_Thread_Mutex &lock,
const ACE_TCHAR *name,
void *arg)
: barrier_finished_ (lock, name, arg),
running_threads_ (count)
{
// ACE_TRACE ("ACE_Sub_Barrier::ACE_Sub_Barrier");
}
ACE_ALLOC_HOOK_DEFINE(ACE_Barrier)
void
ACE_Barrier::dump () const
{
#if defined (ACE_HAS_DUMP)
// ACE_TRACE ("ACE_Barrier::dump");
ACELIB_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
this->lock_.dump ();
ACELIB_DEBUG ((LM_DEBUG, ACE_TEXT ("current_generation_ = %d"), this->current_generation_));
ACELIB_DEBUG ((LM_DEBUG, ACE_TEXT ("\ncount_ = %d"), this->count_));
this->sub_barrier_1_.dump ();
this->sub_barrier_2_.dump ();
ACELIB_DEBUG ((LM_DEBUG, ACE_END_DUMP));
#endif /* ACE_HAS_DUMP */
}
ACE_Barrier::ACE_Barrier (unsigned int count,
const ACE_TCHAR *name,
void *arg)
: lock_ (name, (ACE_mutexattr_t *) arg),
current_generation_ (0),
count_ (count),
sub_barrier_1_ (count, lock_, name, arg),
sub_barrier_2_ (count, lock_, name, arg)
{
ACE_TRACE ("ACE_Barrier::ACE_Barrier");
this->sub_barrier_[0] = &this->sub_barrier_1_;
this->sub_barrier_[1] = &this->sub_barrier_2_;
}
int
ACE_Barrier::wait ()
{
ACE_TRACE ("ACE_Barrier::wait");
ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1);
ACE_Sub_Barrier *sbp =
this->sub_barrier_[this->current_generation_];
// Check for shutdown...
if (sbp == 0)
{
errno = ESHUTDOWN;
return -1;
}
int retval = 0;
if (sbp->running_threads_ == 1)
{
// We're the last running thread, so swap generations and tell
// all the threads waiting on the barrier to continue on their
// way.
sbp->running_threads_ = this->count_;
// Swap generations.
this->current_generation_ = 1 - this->current_generation_;
sbp->barrier_finished_.broadcast ();
}
else
{
--sbp->running_threads_;
// Block until all the other threads wait().
while (sbp->running_threads_ != this->count_)
sbp->barrier_finished_.wait ();
// We're awake and the count has completed. See if it completed
// because all threads hit the barrier, or because the barrier
// was shut down.
if (this->sub_barrier_[this->current_generation_] == 0)
{
errno = ESHUTDOWN;
retval = -1;
}
}
return retval;
}
int
ACE_Barrier::shutdown ()
{
ACE_TRACE ("ACE_Barrier::shutdown");
ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1);
ACE_Sub_Barrier *sbp =
this->sub_barrier_[this->current_generation_];
// Check for shutdown...
if (sbp == 0)
{
errno = ESHUTDOWN;
return -1;
}
// Flag the shutdown
this->sub_barrier_[0] = 0;
this->sub_barrier_[1] = 0;
// Tell all the threads waiting on the barrier to continue on their way.
sbp->running_threads_ = this->count_;
sbp->barrier_finished_.broadcast ();
return 0;
}
ACE_ALLOC_HOOK_DEFINE(ACE_Thread_Barrier)
ACE_Thread_Barrier::ACE_Thread_Barrier (unsigned int count,
const ACE_TCHAR *name)
: ACE_Barrier (count, name)
{
// ACE_TRACE ("ACE_Thread_Barrier::ACE_Thread_Barrier");
}
void
ACE_Thread_Barrier::dump () const
{
#if defined (ACE_HAS_DUMP)
// ACE_TRACE ("ACE_Thread_Barrier::dump");
ACE_Barrier::dump ();
#endif /* ACE_HAS_DUMP */
}
ACE_END_VERSIONED_NAMESPACE_DECL
#endif /* ACE_HAS_THREADS */
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